A corporation administers an aptitude test to all new sales representatives. Management is interested in the extent to which this test is able to predict sales representatives€™ eventual success. The accompanying table records average weekly sales (in thousands of dollars) and aptitude test scores for a random sample of eight representatives.

a. Estimate the linear regression of weekly sales on aptitude test scores.
b. Interpret the estimated slope of the regression line.

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Weekly sales 10 12 28 24 18 16 15 12 Test score 55 60 85 75 80 85 65 60